ML16342C006
| ML16342C006 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 08/03/1993 |
| From: | Peterson S Office of Nuclear Reactor Regulation |
| To: | Rueger G PACIFIC GAS & ELECTRIC CO. |
| References | |
| GL-88-11, GL-92-01, GL-92-1, TAC-M83456, TAC-M83457, NUDOCS 9308200129 | |
| Download: ML16342C006 (8) | |
Text
Docket Nos.
50-275 and 50-323 Hr. Gregory M. Rueger Nuclear Power Generation, B14A Pacific Gas and Electric Company 77 Beale Street, Room 1451 P.O.
Box 770000 San Francisco, California 94177
Dear Hr. Rueger:
August 3, i993
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION RELATED TO GENERIC LETTER 92-01, REVISION 1
FOR DIABLO CANYON POWER PLANT, UNIT NO.
1 (TAC NO. H83456)
AND UNIT NO.
2 (TAC NO. H83457)
By letter dated June 30, 1992, Pacific Gas and Electric Company (PGRE) responded to Generic Letter (GL) 92-01, Revision 1, "Reactor Vessel Structural Integrity."
The GL was issued to obtain information needed to assess compliance with requirements set forth in Appendices G and H to 10 CFR Part 50 and commitments made in response to GL 88-11 regarding reactor vessel structural integrity.
Other regulations requiring compliance are 10 CFR 50.60 and 10 CFR 50.61.
Enclosed is a request for additional information (RAI) that is needed to complete our review of your submittal.
We request that you respond to the RAI within 60 days of your receipt of this letter.
This request for information affects fewer than 10 respondents.
Therefore, it is not subject to Office of Management and Budget review under Pub.
L.96-511.
Please contact us should you have any questions regarding this request.
Sincerely, Original signed by Sheri R. Peterson, Project Manager Project Directorate V
Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation
Enclosure:
Request for additional information cc w/enclosure:
See next page
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%y*y4 UNITEDSTATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 August 3, 1993 Docket Nos. 50-275 and 50-323 Hr. Gregory H. Rueger Nuclear Power Generation, B14A Pacific Gas and Electric Company 77 Beale Street, Room 1451 P.O.
Box 770000 San Francisco, California 94177
Dear Hr. Rueger:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION RELATED TO GENERIC LETTER 92-01, REVISION 1
FOR DIABLO CANYON POWER PLANT, UNIT NO.
1 (TAC NO. H83456)
AND UNIT NO.
2 (TAC NO. H83457)
By letter dated June 30, 1992, Pacific Gas and Electric Company (PGRE) responded to Generic Letter (GL) 92-01, Revision 1, "Reactor Vessel Structural Integrity."
The GL was issued to obtain information needed to assess compliance with requirements set forth in Appendices G and H to 10 CFR Part 50 and commitments made in response to GL 88-11 regarding reactor vessel structural integrity.
Other regulations requiring compliance are 10 CFR 50.60 and 10 CFR 50.61.
Enclosed is a request for additional information'(RAI) that is needed to complete our review of your submittal.
We request that you respond to the RAI within 60 days of your receipt of this letter.
This request for information affects fewer than 10 respondents.
Therefore, it is not subject to Office of Management and Budget review under Pub.
L.96-511.
Please contact us should you have any questions regarding this request.
Sincerely,
Enclosure:
Request for additional information cc w/enclosure:
See next page Sheri R. Peterson, Project Manager Project Directorate V
Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation
P
Mr. Gregory M. Rueger Pacific Gas and Electric Company Diablo Canyon CC:
NRC Resident Inspector Diablo Canyon Nuclear Power Plant c/o U.S. Nuclear Regulatory Commission P. 0.
Box 369 Avila Beach, California 93424 Dr. Richard Ferguson, Energy Chair Sierra Club California 6715 Rocky Canyon Creston, California 93432 Ms. Nancy Culver San Luis Obispo Mothers for Peace P. 0.
Box 164 Pismo Beach, California 93448 Ms. Jacquelyn C. Wheeler 3303 Barranca Court San Luis Obispo, California 93401 Managing Editor The County Telegram Tribune 1321 Johnson Avenue P. 0.
Box 112 San Luis Obispo, California 93406 Chairman San Luis Obispo County Board of Supervisors Room 370 County Government Center San Luis Obispo, California 93408 Mr. Truman Burns Mr. Robert Kinosian California Public Utilities Commission 505 Van Ness, Rm.
4102 San Francisco, California 94102 Mr. Steve Hsu Radiologic Health Branch State Department of Health Services Post Office Box 942732 Sacramento, California 94234 Regional Administrator, Region V
U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Mr. Peter H. Kaufman Deputy Attorney General State of California 110 West A Street, Suite 700 San Diego, California 92101 Christopher J. Warner, Esq.
Pacific Gas 8 Electric Company Post Office Box 7442 San Francisco, California 94120 Mr. John Townsend Vice President and Plant Manager Diablo Canyon Power Plant P. 0.
Box 56 Avila Beach, California 93424 Diablo Canyon Independent Safety Committee ATTN:
Robert R. Wellington, Esq.
Legal Counsel 857 Cass Street, Suite D
Monterey, California 93940
~ ~
RE UEST FOR ADDITIONAL INFORMATION GENERIC LETTER 92-01 REVISION 1
REACTOR VESSEL STRUCTURAL INTEGRITY IABLO CANYON POWER PLANT UNITS 1
AND 2 The following questions relate to GL 92-01, Revision 1 dated March 6, 1992.
For ease of reference, each request is related to the corresponding question in GL 92-01.
Diablo Can on Unit 1:
uestion 2a in GL 92-01 The supplemental information for the licensee's response to GL 92-01, Revision 1 indicates that the initial upper-shelf energy (USE) value of 103 ft-lb for the circumferential weld, 9-442, was estimated from the average of all Diablo Canyon Power Plant welds made with Linde 1092 flux.
Provide all Charpy USE data and analysis from welds that lead to the average value of 103 ft-lb to demonstrate that weld 9-442 will meet the USE requirements of Appendix G,
Make sure that all welds used were fabricated using the same vendor, fabrication time frame, fabrication process, and material specification.
If this cannot be
- provided, then submit an analysis which demonstrates that lower values of USE will provide margins of safety against fracture equivalent to those required by Appendix G of the ASME Code.
Diablo Can on Unit 2:
uestion 2a in GL 92-01 The supplemental information for the licensee's response to GL 92-01, Revision 1 indicates that the initial USE value of 125 ft-lb for the circumferential weld, 9-201, and 88 ft-lb for the axial welds, 3-201 A, B,
and C were estimated from the average of three Charpy tests at 10'F.
Provide all Charpy data and analysis from welds that lead to USE values of 125 and 88 ft-lb to demonstrate that the weld 9-201 and welds 3-201 A, B, and C will meet the USE requirements of Appendix G, 10 CFR 50.
Make sure that all welds used were fabricated using the same vendor, fabrication time frame, fabrication process, and material specification.
If this cannot be provided, then submit an analysis which demonstrates that lower values of USE will provide margins of safety against fracture equivalent to those required by Appendix G of the ASME Code.
J